import cv2
import matplotlib.pyplot as plt
import numpy as np


def show(img):
    cv2.imshow("img", img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

img = cv2.imread("./01_Picture/01_cat.jpg")

# 边界填充
top_size, bottom_size, left_size, right_size = (50, 50, 50, 50)
replicate = cv2.copyMakeBorder(img, top_size, bottom_size, left_size, right_size, borderType=cv2.BORDER_REPLICATE)
reflect = cv2.copyMakeBorder(img, top_size, bottom_size, left_size, right_size, borderType=cv2.BORDER_REFLECT)
reflect101 = cv2.copyMakeBorder(img, top_size, bottom_size, left_size, right_size, borderType=cv2.BORDER_REFLECT101)
wrap = cv2.copyMakeBorder(img, top_size, bottom_size, left_size, right_size, borderType=cv2.BORDER_WRAP)
constant = cv2.copyMakeBorder(img, top_size, bottom_size, left_size, right_size, borderType=cv2.BORDER_CONSTANT, value=0)

plt.subplot(231), plt.imshow(img, 'gray'), plt.title('original')
plt.subplot(232), plt.imshow(replicate, 'gray'), plt.title('replicate')
plt.subplot(233), plt.imshow(reflect, 'gray'), plt.title('reflect')
plt.subplot(234), plt.imshow(reflect101, 'gray'), plt.title('reflect101')
plt.subplot(235), plt.imshow(wrap, 'gray'), plt.title('wrap')
plt.subplot(236), plt.imshow(constant, 'gray'), plt.title('constant')
plt.show()

